Experimental studies on the behaviour of sodium of coal in the initial stage of combustion

Jun Zhang, Chun Li Han, Zheng Yan, Gang Yu, Kun Lei Liu, Yi Qian Xu

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1 Scopus citations


Sodium in coal is an important factor affecting PFBC (pressurized fluidized bed combustion) and IGCC (integrated gasification compined cycle) processes. The behavior of sodium in the initial stage of coal combustion was studied in the temperatures of 800°C and 900°C and at the ambience of rich-oxygen and lean-oxygen, respectively. The results showed that there were not obvious changes in the contents of sodium in the initial stage, suggesting that the release of the sodium would take place mainly in the latter stage of the combustion, namely during the char combustion. The various forms of sodium in the coal revealed a different releasing character in the initial stage. With the increase of combustion time, the water-soluble sodium deceased linearly and the hydrochloric acid-soluble sodium increased linearly. The ammonium acetate-soluble sodium showed a generally increasing tendency, while the insoluble sodium decreased in the initial stage. There was transfer among different forms of the sodium in the initial stage and the main transfer was the water-soluble sodium to the hydrochloric acid-soluble one. The effect of temperature and ambience on the release of sodium depended mostly on the type of coal.

Original languageEnglish
Pages (from-to)53
Number of pages1
JournalJournal of Fuel Chemistry and Technology
Issue number1
StatePublished - 2001


  • Alkali behavior
  • Coal
  • Combustion
  • Sodium

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Physical and Theoretical Chemistry


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